Hacker News Reader

It does have S/MIME, I think?

It does. But I have used S/MIME maybe a handful of times in my career. Whereas, GnuPG dozens of times a day, and in my personal life.

Do you use GPG for signing primarily or also for email encryption? Dozens of times a day puts you in rarefied GnuPG air!

Basically for delivering and receiving encrypted payloads programmatically or manually.

And once in a while using it for email. :)

You'd be surprised how much GnuPG is used out in the wild.